By default currency is either set in single currency or in default currency by the administrator so that it remains consistent accross.
if this property is set to true.
glide.i18n.single_currency
Display all currencies in the same currency code, regardless of a user's locale, country, or language code.
if this property is set as per country then ((for example, en.GB for Britain, fr.FR for France, de.DE for Germany, or ja.JP for Japan))
glide.system.locale
Determines the system's default currency into which all prices are automatically converted before other sums or conversions are performed. Changing this property after any price or currency fields have been given a value may result in improper conversion or prices that sum incorrectly.
Mark my ANSWER as CORRECT and HELPFUL if it helps.
https://docs.servicenow.com/bundle/london-platform-administration/page/administer/localization/task/...
